what does idhgaam noon sakeen means?

Question
what does idhgaam noon sakeen means?Answer
Idghaam means merging. So when a letter has "idghaam" into another, it merges into second letter so that what is heard is the second letter, empahisized with a shaddah (double). Noon is the Arabic letter . Saakinah (you wrote sakeen, but the correct word is saakinah) means voweless. So idghaam noon saakinah means, the merging of the non-voweled letter into the letter which follows it.